CN110920749B - Steering system, operation method and engineering vehicle - Google Patents
Steering system, operation method and engineering vehicle Download PDFInfo
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- CN110920749B CN110920749B CN201911291597.9A CN201911291597A CN110920749B CN 110920749 B CN110920749 B CN 110920749B CN 201911291597 A CN201911291597 A CN 201911291597A CN 110920749 B CN110920749 B CN 110920749B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/061—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle provided with effort, steering lock, or end-of-stroke limiters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
- B62D5/063—Pump driven by vehicle engine
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
The invention relates to a steering system, an operation method and an engineering vehicle. Wherein, a steering system includes: the steering oil cylinder comprises a first steering cavity and a second steering cavity; the output end of the first oil way is connected with the steering oil cylinder; the steering gear is arranged on the first oil way; the steering gear is used for controlling the on-off of fluid between the first oil path and the steering oil cylinder in an operable mode and enabling oil of the first oil path to be led to the first steering cavity or the second steering cavity in an operable mode; the output end of the second oil path is connected with the steering oil cylinder, and the second oil path is configured to be selectively communicated or disconnected with the steering oil cylinder and selectively communicated with the first steering cavity or the second steering cavity; and the oil pump is respectively connected with the first oil path and the second oil path. The invention can adjust the steering turns of the steering wheel adaptively according to different working conditions, is suitable for the working conditions that the operation in a narrow area frequently steers and the number of the required steering turns is small, and is also suitable for the working conditions that the driving stability is ensured in a long-distance transition and the number of the required steering turns is large.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a steering system, an operation method and an engineering vehicle.
Background
Off-road tire cranes, container face cranes and other engineering vehicles generally operate in fixed areas, often need to steer in narrow spaces, and in order to deal with frequent steering and reduce the intensity of driver operation, it is desirable that the number of turns be small. However, in the long-distance transition process, the speed of the vehicle is high, a small-angle correction steering wheel is needed in the driving process, the number of steering turns is too small, and when the small-angle correction is carried out, the turning angle is too large, so that a driver can frequently correct the turning angle, and the high-speed driving stability of the whole vehicle is reduced.
Disclosure of Invention
Some embodiments of the invention provide a steering system, an operation method and an engineering vehicle, which are used for relieving the problem that the number of steering turns cannot be adaptively adjusted.
Some embodiments of the present invention provide a steering system, comprising:
the steering oil cylinder comprises a first steering cavity and a second steering cavity;
the output end of the first oil way is connected with the steering oil cylinder;
the steering gear is arranged on the first oil way; the steering gear is used for controlling the on-off of fluid between the first oil path and the steering oil cylinder in an operable mode and enabling oil of the first oil path to be led to the first steering cavity or the second steering cavity in an operable mode;
the output end of the second oil path is connected with the steering oil cylinder, and the second oil path is configured to be selectively communicated or disconnected with the steering oil cylinder and selectively communicated with the first steering cavity or the second steering cavity; and
and the oil pump is respectively connected with the first oil path and the second oil path.
In some embodiments, the steering system includes a first priority valve provided in the first oil passage between the steering gear and the oil pump.
In some embodiments, the steering system includes an on-off valve provided in the second oil passage, the on-off valve being configured to control on/off of the second oil passage.
In some embodiments, the steering system includes a second priority valve provided in the second oil passage between the on-off valve and the steering cylinder.
In some embodiments, the steering system comprises a reversing valve, the reversing valve is arranged on the second oil path, the reversing valve comprises a first station and a second station, the reversing valve is arranged at the first station, the oil at the output end of the second oil path is communicated with the first steering cavity, the reversing valve is arranged at the second station, and the oil at the output end of the second oil path is communicated with the second steering cavity.
In some embodiments, the directional valve includes a first control chamber and a second control chamber; the first control cavity is connected with the first steering cavity, and the second control cavity is connected with the second steering cavity; when the oil pressure in the first control cavity is larger than the oil pressure in the second control cavity, the reversing valve is positioned at a first station; when the oil pressure in the second control cavity is larger than the oil pressure in the first control cavity, the reversing valve is located at a second station.
In some embodiments, the diverter includes a load feedback port connected to the control chamber of the first priority valve to control the opening size of the first priority valve.
In some embodiments, the diverter includes a load feedback port connected to a control chamber of the second priority valve to control the opening size of the second priority valve.
Some embodiments of the invention provide a working vehicle comprising the steering system described above.
Some embodiments of the present invention provide a method of operating the steering system described above, including:
when steering is carried out under the normal running working condition, oil in the first oil way is led to the first steering cavity or the second steering cavity through the steering gear; the second oil way is disconnected from the steering oil cylinder;
when steering is carried out under the working condition, oil in the first oil way is led to the first steering cavity or the second steering cavity through the steering gear; meanwhile, the oil of the second oil passage is led to the first steering chamber or the second steering chamber.
Based on the technical scheme, the invention at least has the following beneficial effects:
in some embodiments, the steering system comprises an oil pump, the oil pump is respectively connected with the first oil path and the second oil path, and when steering is carried out under the normal running condition, the oil in the first oil path is led to the first steering cavity or the second steering cavity of the steering oil cylinder through the steering gear; the second oil way is disconnected from the steering oil cylinder, so that the output flow of a steering gear is reduced, the number of turns of a steering wheel is increased, small-angle correction is facilitated in the driving process, and the driving stability of the vehicle is ensured; when the steering is carried out under the working condition, the oil of the first oil way is led to a first steering cavity or a second steering cavity of the steering oil cylinder through the steering gear; simultaneously, the oil of second oil circuit leads to the first chamber or the second chamber that turns to of steering cylinder, the output flow of increase steering gear, make the number of turns to of steering wheel reduce, reduce manipulation strength, convenience of customers changes, therefore, the a steering system that this disclosed embodiment provided can make the number of turns to of steering wheel carry out the adaptability adjustment according to different operating modes, both be applicable to the operation in the narrow and small region and frequently turn to, require the operating mode that the number of turns is few, be applicable to long distance changes again and guarantee to travel stably, require the operating mode that the number of turns is many.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic illustration of a steering system provided in accordance with some embodiments of the present invention;
FIG. 2 is a schematic illustration of a steering mode provided according to some embodiments of the present invention.
The reference numbers in the drawings illustrate the following:
1-a steering oil cylinder; 2-a first oil path; 3-a diverter; 4-a second oil path; 5-an oil pump; 6-a first priority valve; 7-a switch valve; 8-a second priority valve; 9-a reversing valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
As shown in fig. 2, multi-mode steering: refers to various steering forms of the vehicle. Common forms of steering are: front axle (front group) independent steering a, rear axle (rear group) independent steering b, small turning (also called coordination) steering c, crab steering d and the like.
When the small-turn steering is performed, the steering directions of the front group of wheels and the rear group of wheels are opposite, and the minimum turning radius can be realized, so that the small-turn steering is called.
When the crab turns to the direction d, the turning directions of the front group of wheels and the rear group of wheels are the same, so that the crab can move like walking, and the crab turning is called as crab turning.
The number of turns of the steering gear is as follows: the tire turns from the left limit to the right limit, the number of turns the steering wheel makes, which is inversely proportional to the displacement of the steering gear, the greater the displacement of the steering gear, the fewer the number of turns the steering wheel makes.
When a vehicle normally runs, the output flow of a steering gear is generally required to be small, and the number of steering turns of a steering wheel is large; when the steering is performed in the mode, the output flow of the steering gear is generally required to be large, and the number of turns of the steering wheel is required to be small.
Based on the above, some embodiments of the present disclosure provide a steering system, which is configured to reduce output flow of a steering device and increase the number of turns of a steering wheel when a vehicle normally travels, so as to facilitate small-angle correction during traveling and ensure stable traveling of the vehicle; when the mode under the vehicle operation condition turns to, increase the output flow of steering gear, make the number of turns of steering wheel reduce, reduce manipulation strength.
In some embodiments, as shown in fig. 1, the steering system includes a steering cylinder 1, a first oil passage 2, a steering gear 3, a second oil passage 4, and an oil pump 5.
The steering cylinder 1 includes a first steering chamber and a second steering chamber. The first steering cavity is used for controlling the left-turn or the right-turn of the vehicle, and correspondingly, the second steering cavity is used for controlling the right-turn or the left-turn of the vehicle.
The output end of the first oil path 2 is connected with the steering oil cylinder 1.
The steering gear 3 is provided in the first oil passage 2. The steering gear 3 is operable to control the fluid connection and disconnection between the first oil passage 2 and the steering cylinder 1. And the steering gear 3 is operable to direct the oil of the first oil passage 2 to the first steering chamber or the second steering chamber.
In some embodiments, the diverter 3 comprises a fully hydraulic diverter 3.
Full hydraulic steering gear: the hydraulic power steering device is a hydraulic power steering device without mechanical connection between an output end and an input end. The manual steering device has the advantages of flexible and labor-saving operation, simple structure, convenient overall arrangement and capability of realizing manual steering after the interruption of a power oil source.
The steering gear in the disclosed embodiment may employ a steering gear of the related art, and may employ a steering gear of various displacements.
The output end of the second oil path 4 is connected with the steering oil cylinder 1. The second oil passage 4 is configured to be selectively communicated with or disconnected from the steering cylinder 1. And the second oil passage 4 communicates with the steering cylinder 1, the second oil passage 4 is configured to selectively communicate with the first steering chamber or the second steering chamber.
The oil pump 5 is connected to the first oil passage 2 and the second oil passage 4, respectively. The oil pump 5 is used to supply oil to the first oil passage 2 and the second oil passage 4.
In some embodiments, a method of operation of a steering system, comprising:
when the vehicle turns under the normal running working condition, the oil in the first oil way 2 is led to the first turning cavity or the second turning cavity through the steering gear 3; the second oil path 4 is disconnected from the steering oil cylinder 1 to reduce the output flow of a steering gear, increase the number of turns of a steering wheel, facilitate small-angle correction in the driving process and ensure the driving stability of the vehicle.
When the vehicle turns under the working condition of the vehicle, the oil in the first oil way 2 is led to the first turning cavity or the second turning cavity through the steering gear 3; meanwhile, the oil of the second oil path 4 is led to the first steering cavity or the second steering cavity to increase the output flow of the steering gear, so that the number of turns of the steering wheel is reduced, and the operation intensity is reduced.
The steering system that this disclosed embodiment provided can make the number of turns of steering wheel carry out the adaptability adjustment according to different work condition, both had been applicable to the frequent turning of operation in the narrow and small region, required the few operating mode of number of turns, be applicable to long distance transition again and guarantee the stability of traveling, require the many operating mode of number of turns, can improve the manipulation travelling comfort, it frequently turns to have alleviated the operation in the narrow and small region, it is few to require the number of turns, and long distance transition guarantees the stability of traveling, requires the many problem of number of turns.
The flow amplifying structure with the first oil way 2 and the second oil way 4 connected in parallel is adopted, the reliability is high, and when the second oil way 4 breaks down, the second oil way 4 can be disconnected, so that the main way (the first oil way 2) can still operate.
In some embodiments, the steering system includes a first priority valve 6, and the first priority valve 6 is provided in the first oil passage 2 between the steering gear 3 and the oil pump 5.
A priority valve: the output oil of the oil pump 5 is preferentially supplied to the steering gear 3 by load feedback. Because the load feedback signal of the priority valve is communicated with the load feedback signal of the steering gear, the priority valve provides oil according to the required flow of the steering gear.
The priority valve includes a P port (oil inlet), a CF port (first working oil port), an EF port (second working oil port), and an LS port (load feedback port). When the P port takes oil, it is preferentially supplied to the CF port. When the steering gear does not steer, the CF port is in a closed state, the pressure of the LS port is zero at the moment, the P port is communicated with the EF port, and the EF port outputs oil to a working system; when the steering gear turns, the load feedback of the steering gear acts on the LS port, the P port is communicated with the CF port, and the CF port outputs oil to an oil inlet of the steering gear.
In some embodiments, the steering system includes an on-off valve 7, the on-off valve 7 is provided in the second oil passage 4, and the on-off valve 7 is configured to control on/off of the second oil passage 4.
The steering mode is selected through the switch valve 7, the switch valve 7 is not electrified during normal running, and oil output by the oil pump 5 is supplied to the steering gear 3 through the first priority valve 6 and acts on the steering oil cylinder 1; when the mode under the working condition turns to, the switch valve 7 is electrified, and the oil output by the oil pump 5 is simultaneously supplied to the steering oil cylinder 1 through the first oil path 2 and the second oil path 4 which are connected in parallel.
In some embodiments, the steering system includes a second priority valve 8, and the second priority valve 8 is provided in the second oil passage 4 between the on-off valve 7 and the steering cylinder 1.
The structure of second priority valve 8 is the same as that of first priority valve 6, and the principle is the same, and will not be described again.
In some embodiments, the steering system comprises a reversing valve 9, the reversing valve 9 is arranged on the second oil path 4, the reversing valve 9 comprises a first station and a second station, the reversing valve 9 is arranged at the first station, oil at the output end of the second oil path 4 is communicated with the first steering cavity, the reversing valve 9 is arranged at the second station, and oil at the output end of the second oil path 4 is communicated with the second steering cavity.
In some implementations, the directional valve 9 includes a first control chamber and a second control chamber. A first control cavity of the reversing valve 9 is connected with a first steering cavity of the steering oil cylinder 1, and a second control cavity of the reversing valve 9 is connected with a second steering cavity of the steering oil cylinder 1. When the oil pressure in the first control chamber of the directional control valve 9 is greater than the oil pressure in the second control chamber of the directional control valve 9, the directional control valve 9 is in the first position. When the oil pressure in the second control chamber of the directional control valve 9 is greater than the oil pressure in the first control chamber of the directional control valve 9, the directional control valve 9 is in the second position.
In some implementations, the directional valve 9 is located between the steering cylinder 1 and the second priority valve 8.
In some embodiments, the diverter 3 comprises a load feedback port connected to the control chamber of the first priority valve 6, i.e. the load feedback port of the diverter 3 is connected to the LS port of the first priority valve 6 to control the opening size of the first priority valve 6.
In some embodiments, the diverter 3 comprises a load feedback port connected to the control chamber of the second priority valve 8, i.e. the load feedback port of the diverter 3 is connected to the LS port of the second priority valve 8 to control the opening size of the second priority valve 8.
By utilizing a load feedback signal, the first priority valve 6 and the second priority valve 8 output equal-flow oil matched with the steering gear 3 at the same time, so that the function of flow amplification is achieved, the number of turns of the steering wheel is reduced by half, and the rapid steering is realized.
In some implementations, the steering system performs mode selection through the switch valve 7, and controls the two parallel priority valves to output the same flow rate by using load feedback of the steering cavity 8, so as to achieve double-flow output, and the specific flow is as follows.
1) For long-distance transition in normal highway driving mode
The switch valve 7 is not electrified, the oil output by the oil pump 5 flows through the first priority valve 6 to be supplied to the steering gear 3, and the steering gear 3 controls the steering cylinder 1 to steer.
In this mode, there is no difference from the conventional system.
2) Under the working condition, the double-flow output mode is used for the working condition of low-speed frequent steering
The switch valve 7 is electrified, when the steering wheel turns left, the load feedback port of the steering gear 3 builds pressure, the first priority valve 6 is in a CF port output state according to the load requirement, oil provided by the oil pump 5 is supplied to the steering gear 3, meanwhile, the load of the steering gear also acts on the LS port of the second priority valve 8, and because the load pressure is taken from the load feedback port of the steering gear 3, the openings of the first priority valve 6 and the second priority valve 8 are the same, and oil with the same flow is output.
In the state, the oil output by the first priority valve 6 acts on a first steering cavity of the steering oil cylinder 1 through a port CL of the steering gear, and the pressure of the port CL puts a valve core of the reversing valve 9 at a first station; the oil from the second priority valve 8 also acts on the first steering chamber of the steering cylinder 1 via the directional control valve 9, i.e. in this mode, twice the flow is supplied to the steering cylinder 1 compared to the normal road mode.
When the steering wheel rotates to a designated angle, the load feedback pressure of the steering gear 3 disappears, and at the moment, the first priority valve 6 and the first priority valve 8 do not provide oil for the steering cylinder 1 any more.
When the steering wheel turns right, the action principle is the same as above.
All elements in the steering system provided by the embodiment of the disclosure are conventional elements, and the cost is low. And the flow control is carried out by adopting load feedback, so that the method is safe and reliable.
Some embodiments also provide a working vehicle comprising the steering system described above.
The engineering vehicle comprises an off-road tire crane or a container front lifting vehicle and the like, needs to work in a fixed area, turns in a narrow space and needs to be transferred for a long distance.
In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are used to define the components, and are used only for the convenience of distinguishing the components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Furthermore, the technical features of one embodiment may be combined with one or more other embodiments advantageously without explicit negatives.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (8)
1. A steering system, comprising:
the steering oil cylinder (1) comprises a first steering cavity and a second steering cavity;
the output end of the first oil way (2) is connected with the steering oil cylinder (1);
a steering gear (3) provided in the first oil passage (2); the steering gear (3) is used for controlling the on-off of fluid between the first oil path (2) and the steering oil cylinder (1) and leading the oil of the first oil path (2) to the first steering cavity or the second steering cavity;
the output end of the second oil path (4) is connected with the steering oil cylinder (1), and the second oil path (4) is configured to be selectively communicated or disconnected with the steering oil cylinder (1) and selectively communicated with the first steering cavity or the second steering cavity;
the oil pump (5) is respectively connected with the first oil way (2) and the second oil way (4); and
the reversing valve (9) is arranged on the second oil path (4), the reversing valve (9) comprises a first station and a second station, the reversing valve (9) is arranged at the first station, oil at the output end of the second oil path (4) is led to the first steering cavity, the reversing valve (9) is arranged at the second station, and oil at the output end of the second oil path (4) is led to the second steering cavity;
the reversing valve (9) comprises a first control cavity and a second control cavity; the first control cavity is connected with the first steering cavity, and the second control cavity is connected with the second steering cavity; when the oil pressure in the first control cavity is larger than the oil pressure in the second control cavity, the reversing valve (9) is in a first working position; when the oil pressure in the second control cavity is larger than the oil pressure in the first control cavity, the reversing valve (9) is positioned at a second station.
2. A steering system according to claim 1, characterized by comprising a first priority valve (6), said first priority valve (6) being provided in said first oil passage (2) and being located between said steering gear (3) and said oil pump (5).
3. The steering system according to claim 1, characterized by comprising an on-off valve (7), wherein the on-off valve (7) is provided to the second oil passage (4), and the on-off valve (7) is configured to control on/off of the second oil passage (4).
4. A steering system according to claim 3, characterized by comprising a second priority valve (8), said second priority valve (8) being provided in said second oil passage (4) between said on-off valve (7) and said steering cylinder (1).
5. A steering system according to claim 2, wherein the steering gear (3) comprises a load feedback port connected to the control chamber of the first priority valve (6) to control the opening size of the first priority valve (6).
6. A steering system according to claim 4, wherein the steering gear (3) comprises a load feedback port connected to the control chamber of the second priority valve (8) to control the opening size of the second priority valve (8).
7. A working vehicle, characterized by comprising a steering system according to any one of claims 1 to 6.
8. A method of operating the steering system of claim 1, comprising:
when steering is carried out under the normal running working condition, oil in the first oil way (2) is led to the first steering cavity or the second steering cavity through the steering gear (3); the second oil path (4) is disconnected from the steering oil cylinder (1);
when steering is carried out under the working condition, oil in the first oil way (2) is led to the first steering cavity or the second steering cavity through the steering gear (3); meanwhile, the oil of the second oil passage (4) is led to the first steering chamber or the second steering chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911291597.9A CN110920749B (en) | 2019-12-16 | 2019-12-16 | Steering system, operation method and engineering vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911291597.9A CN110920749B (en) | 2019-12-16 | 2019-12-16 | Steering system, operation method and engineering vehicle |
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| CN110920749A CN110920749A (en) | 2020-03-27 |
| CN110920749B true CN110920749B (en) | 2021-03-09 |
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| CN201911291597.9A Active CN110920749B (en) | 2019-12-16 | 2019-12-16 | Steering system, operation method and engineering vehicle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935918A (en) * | 1974-09-09 | 1976-02-03 | Caterpillar Tractor Co. | Dual source hydraulic steering system |
| SE8802957D0 (en) * | 1988-08-23 | 1988-08-23 | Bahco Hydrauto Ab | HYDRAULIC CONTROL DEVICE FOR ELECTRIC DRIVEN VEHICLES |
| CN101580079A (en) * | 2008-05-02 | 2009-11-18 | 伊顿公司 | Load-reaction steering system with isolation valve |
| CN202429243U (en) * | 2012-01-16 | 2012-09-12 | 中联重科股份有限公司 | Servo steering control system and crane |
| CN203270662U (en) * | 2013-05-08 | 2013-11-06 | 佛山金葵子植物营养有限公司 | Hydraulic oil circuit, hydraulic steering system, and loading machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10435064B2 (en) * | 2014-03-06 | 2019-10-08 | Eaton Intelligent Power, Ltd. | Load-reaction switching valve assembly |
-
2019
- 2019-12-16 CN CN201911291597.9A patent/CN110920749B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935918A (en) * | 1974-09-09 | 1976-02-03 | Caterpillar Tractor Co. | Dual source hydraulic steering system |
| SE8802957D0 (en) * | 1988-08-23 | 1988-08-23 | Bahco Hydrauto Ab | HYDRAULIC CONTROL DEVICE FOR ELECTRIC DRIVEN VEHICLES |
| CN101580079A (en) * | 2008-05-02 | 2009-11-18 | 伊顿公司 | Load-reaction steering system with isolation valve |
| CN202429243U (en) * | 2012-01-16 | 2012-09-12 | 中联重科股份有限公司 | Servo steering control system and crane |
| CN203270662U (en) * | 2013-05-08 | 2013-11-06 | 佛山金葵子植物营养有限公司 | Hydraulic oil circuit, hydraulic steering system, and loading machine |
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| CN110920749A (en) | 2020-03-27 |
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